If two collinear vectors A and B are added, the resultant has a magnitude equal to 4.0. If B is subtracted from A , the resultant has a magnitude equal to 8.0. What is the magnitude of B?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter1: Introduction And Vectors
Section: Chapter Questions
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If two collinear vectors A and B are added, the resultant has a magnitude equal to 4.0. If B is subtracted from A , the resultant has a magnitude equal to 8.0. What is the magnitude of B?

Expert Solution
Step 1

Given, the resultant of the sum of two collinear vectors A and B has magnitude 4. It can be written as,

A+B=4

Since A and B are collinear, the magnitude of the sum of vectors is equal to the sum of the of the magnitudes of the individual vectors. Hence, we can write

A+B=4 ......(1)

Here, A and B are the magnitudes of vectors A and respectively.

 

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